Mattress



FIG. 1 is a left side, top perspective view of a mattress embodying my design;

FIG. 2 is a top plan view thereof, the bottom being a mirror image thereof;

FIG. 3 is a left side view thereof, the right side being a mirror image thereof;

FIG. 4 is a foot end view thereof, the head end being a mirror image thereof,

FIG. 5 is an enlarged perspective view taken from FIG. 1 showing a portion of the mattress; and,

FIG. 6 is an enlarged side view taken from FIG. 3 showing a portion of the mattress.

The broken line boundaries are environmental and form no part of the claimed design. Accordingly, the dash-dot-dot-dash broken lines represent environmental subject matter showing the claimed mattress in use and do not form part of the claimed design. The dash-dot-dash broken lines surrounding FIGS. 5 and 6 and the corresponding detailed reference rectangles shown in FIGS. 1 and 2 represent boundaries that form no part of the claimed design. The short dot-dot broken lines represent claimed stitching and do form part of the claimed design. 

CLAIM I claim the ornamental design for a mattress, as shown and described. 